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metamorphic rock
This term describes a specific geological category where the primary characteristic is transformation. It is distinguished from igneous rocks, which form from cooling magma, and sedimentary rocks, which form from accumulated debris. The term implies a state of change under extreme environmental stress, typically deep within the Earth's crust.
In a technical context, the term is often used as a broad classification. When referring to specific types of metamorphic rock, geologists use more precise terms like gneiss, schist, or marble. Because it describes a category of material, it is typically treated as a countable noun when referring to different types or samples of such rocks.
Meanings
Examples
Marble is a well known example of a metamorphic rock.
The teacher asked us to identify the metamorphic rock under the microscope.
Is this sample a sedimentary or a metamorphic rock?
Is this sample a sedimentary or a metamorphic rock?
High pressure and temperature transform a protolith into a metamorphic rock.
High pressure and temperature transform a protolith into a metamorphic rock.
I wonder if this mountain range is composed primarily of metamorphic rock.
The geologist pointed to the banded texture of the metamorphic rock.
Metamorphic rock forms deep within the earth where heat is intense.
Look at how the minerals have aligned in this piece of metamorphic rock.